Portable burglar alarm



FIG. 1 is a right front perspective view of a portable burglar alarm showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a right elevation view thereof;

FIG. 5 is a left elevation view thereof; and

FIG. 6 is a rear elevation view thereof. 

The ornamental design for a portable burglar alarm, as shown. 